Jim Letten, U.S. attorney for the Eastern District of Louisiana, announces his resignation during a news conference in New Orleans on Thursday, Dec. 6, 2012. His wife, JoAnn, is at left. (AP Photo/Gerald Herbert)

Photo by: Gerald Herbert

Jim Letten, U.S. attorney for the Eastern District of Louisiana, announces his resignation during a news conference in New Orleans on Thursday, Dec. 6, 2012. His wife, JoAnn, is at left. (AP Photo/Gerald Herbert)